In this talk, I will introduce the recent work about the analysis of the electrical double layer (EDL) described in singularly perturbation CCPB models. In order to clearly understand the effect of the effects of the surface dielectric constant and curvature on the electrostatic potential in EDL, we consider the physical domain to be an annular domain and establish the pointwise estimate of the solution near the boundary. Furthermore, as an application on the EDL, our result provides a direct way to calculate the EDL capacitance.

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